Congratulations. You finally have a handle on the social media thing. Now the real work begins: pinpointing the most powerful people in your online networks and cultivating those relationships into more business wins.

Big brands like beauty retailer Sephora and giffgaff, the U.K.'s fastest-growing mobile network, have called on enterprise social media suite provider Lithium Technologies to help launch and sustain their strong online communities. According to Lithium's principal scientist Michael Wu, a key part of that process is identifying top influencers and turning them into company advocates.

For small businesses with smaller budgets, there happen to be a number of low-cost (or free) social analytics companies--several with targeted business offerings--that provide scores and reports to help you find and engage your network superstars.

Many of them are still works in progress, Wu cautions, with an overemphasis on "bandwidth," or activity and quantity of followers, friends and fans. "Even if you make a lot of noise, you're not guaranteed to be influential," he explains. "But of course the algorithms will get better."

Below, we take a quick look at a few of the most influential influence rankers.

Advantage: The most established of the bunch, the subscription service (plans are $499 a month and up) helps clients like Honda identify and then engage top influencers relevant to a specific brand, product and campaign